diff options
Diffstat (limited to 'board/armltd/integratorap/timer.c')
| -rw-r--r-- | board/armltd/integratorap/timer.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/board/armltd/integratorap/timer.c b/board/armltd/integratorap/timer.c deleted file mode 100644 index e85f8b6..0000000 --- a/board/armltd/integratorap/timer.c +++ /dev/null @@ -1,171 +0,0 @@ -/* - * (C) Copyright 2002 - * Sysgo Real-Time Solutions, GmbH <www.elinos.com> - * Marius Groeger <mgroeger@sysgo.de> - * - * (C) Copyright 2002 - * David Mueller, ELSOFT AG, <d.mueller@elsoft.ch> - * - * (C) Copyright 2003 - * Texas Instruments, <www.ti.com> - * Kshitij Gupta <Kshitij@ti.com> - * - * (C) Copyright 2004 - * ARM Ltd. - * Philippe Robin, <philippe.robin@arm.com> - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> - -/* The Integrator/AP timer1 is clocked at 24MHz - * can be divided by 16 or 256 - * and is a 16-bit counter - */ -/* U-Boot expects a 32 bit timer running at CONFIG_SYS_HZ*/ -static ulong timestamp; /* U-Boot ticks since startup */ -static ulong total_count = 0; /* Total timer count */ -static ulong lastdec; /* Timer reading at last call */ -static ulong div_clock = 256; /* Divisor applied to the timer clock */ -static ulong div_timer = 1; /* Divisor to convert timer reading - * change to U-Boot ticks - */ -/* CONFIG_SYS_HZ = CONFIG_SYS_HZ_CLOCK/(div_clock * div_timer) */ - -#define TIMER_LOAD_VAL 0x0000FFFFL -#define READ_TIMER ((*(volatile ulong *)(CONFIG_SYS_TIMERBASE+4)) & 0x0000FFFFL) - -/* all function return values in U-Boot ticks i.e. (1/CONFIG_SYS_HZ) sec - * - unless otherwise stated - */ - -/* starts a counter - * - the Integrator/AP timer issues an interrupt - * each time it reaches zero - */ -int timer_init (void) -{ - /* Load timer with initial value */ - *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = TIMER_LOAD_VAL; - /* Set timer to be - * enabled 1 - * free-running 0 - * XX 00 - * divider 256 10 - * XX 00 - */ - *(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = 0x00000088; - total_count = 0; - /* init the timestamp and lastdec value */ - reset_timer_masked(); - - div_timer = CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ; - div_timer /= div_clock; - - return (0); -} - -/* - * timer without interrupts - */ -void reset_timer (void) -{ - reset_timer_masked (); -} - -ulong get_timer (ulong base_ticks) -{ - return get_timer_masked () - base_ticks; -} - -void set_timer (ulong ticks) -{ - timestamp = ticks; - total_count = ticks * div_timer; - reset_timer_masked(); -} - -/* delay x useconds */ -void udelay (unsigned long usec) -{ - ulong tmo, tmp; - - /* Convert to U-Boot ticks */ - tmo = usec * CONFIG_SYS_HZ; - tmo /= (1000000L); - - tmp = get_timer_masked(); /* get current timestamp */ - tmo += tmp; /* wake up timestamp */ - - while (get_timer_masked () < tmo) { /* loop till event */ - /*NOP*/; - } -} - -void reset_timer_masked (void) -{ - /* reset time */ - lastdec = READ_TIMER; /* capture current decrementer value */ - timestamp = 0; /* start "advancing" time stamp from 0 */ -} - -/* converts the timer reading to U-Boot ticks */ -/* the timestamp is the number of ticks since reset */ -/* This routine does not detect wraps unless called regularly - ASSUMES a call at least every 16 seconds to detect every reload */ -ulong get_timer_masked (void) -{ - ulong now = READ_TIMER; /* current count */ - - if (now > lastdec) { - /* Must have wrapped */ - total_count += lastdec + TIMER_LOAD_VAL + 1 - now; - } else { - total_count += lastdec - now; - } - lastdec = now; - timestamp = total_count/div_timer; - - return timestamp; -} - -/* waits specified delay value and resets timestamp */ -void udelay_masked (unsigned long usec) -{ - udelay(usec); -} - -/* - * This function is derived from PowerPC code (read timebase as long long). - * On ARM it just returns the timer value. - */ -unsigned long long get_ticks(void) -{ - return get_timer(0); -} - -/* - * Return the timebase clock frequency - * i.e. how often the timer decrements - */ -ulong get_tbclk (void) -{ - return CONFIG_SYS_HZ_CLOCK/div_clock; -} |